Vacuum cleaner



FIG. 1 is a front perspective of a vacuum cleaner showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a front perspective view thereof.

The broken line showing of various regions is for environmental purposes only and forms no part of the claimed design. 

The ornamental design for a vacuum cleaner, as shown and described. 